Newbie: Zoas are not opening like before

[laguest]

Temp: 77-78
Salinity: 1.024 "“ 1.025
PH: 8.1
Alkalinity: 9-10
Ammonia: 0
Nitrite: 0
Nitrate: 15
Phosphates: 0
Calcium: 400

We dose for Alkalinity and Calcium every night as needed.

These Zoas where part of the first corals we added to our new tank.
For the first 2 weeks they looked great, always fully opened.
This week they have started to not open, sometimes you get a bunch that do open, maybe 10 or so. Then later close and others open, but not all open at the same time and when they do open they don't seem to be open as much. Everything else in the tank is doing great.

Change the water flow up and down, no change.
Changed the light level up and down, no change.

What have we done that may have caused this?
I cleaned algae off the glass, when I did that we had a bloom of free floating algae in the tank for approx. 1.5 days. You could see it when looking down the tank from the side.
My son feed them BRS reef chill by blowing it onto them from a squeeze bottle.

This weekend we plan to do our first water change, 10% of 75 gallons, clean the sock and return pump.

Any thoughts?

Thanks

Before

Now

 

[laguest]

Looks like the links to the pics I uploaded did not work. I will attach some pics from when we first got them and how they look now.

 

[laguest]

Before adding them to the tank we also dipped them in ReVive for 5 min

 

[sharkboy99999]

Do you have a clownfish?

Sent from my SM-G900P using Tapatalk

 

[laguest]

Yes 2, but they never go near the Zoa.

I believe we have Zoa eating nudibranchs, we just pulled one off a rock and it looks just like the pictures we see.

Now what?

 

[laguest]

OK, lots of info on this one on the forum.
We have started the process to get these cleaned up

 

[Snookster]

First, stop feeding them reef chili, they get by fine on fish poop and light. You're probably just elevating your PO4 and NO3.

Do you have other corals (if not, why are you dosing alk/calc)? Are they happy? Your pics show them to look irritated, so you probably either have a pest or a cyano problem. If you have a food baster, try blowing them out a little and see if anything goes flying out.

Your pics look like your tank is not yet mature, remember, anything good NEVER happens fast.